Hello. two weeks ago my space runner started to lose coolant (despite sufficient cooling frost protection). so first a new cooler one. this one held exactly 2 days until it became leaky again. now I have the cylinder head gasket, motor thermostat and once again a new cooler installed. the end result is that the cooler is leaking again. the cooling system has been ventilated and the cooler fan is running as well. the cooler hoses blow up so strongly that these have also installed a new timing belt with tension roller. can it possibly still be due to the water pump (promotion), or are there general problems with the cylinder head of a 4G93 engine?